Passing the CCNA is tough, and one of the toughest parts is keeping all the acronyms straight! Frame Relay has plenty of those, and today we're going to examine what DLCIs do and how they're mapped on a Cisco router.
Laptop Battery Frame Relay VCs use Data-Link Connection Identifiers (DLCI - pronounced "del-see") as their addresses. Unlike other Cisco technologies, VCs have only a single DLCI in their header. They do not have a source and destination.
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Thinkpad DLCIs have local significance only. DLCI numbers are not advertised to other routers, and other routers can use the same DLCI numbers without causing connectivity issues.
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Microsoft Cisco uses the term global addressing to describe a technique by which a router in a frame relay network is reached via the same DLCI number from each router in the network. For example, in a 25-router network, the same DLCI number would be used to reach "Router A" by each router.
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Laptop Computers Global Addressing is an organizational tool that does not affect the fact that DLCIs have local significance only.
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Laptop Computer The locally significant DLCI must be mapped to the destination router's IP address. There are two options for this, Inverse ARP and static mapping.
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Desktop Computer In both of the following examples, the single physical Serial interface on Router 1 is configured with two logical connections through the frame relay cloud, one to Router 2 and one to Router 3.
Notebooks Inverse ARP runs by default once Frame Relay is enabled, and starts working as soon as you open the interface. By running show frame-relay map after enabling Frame Relay, two dynamic mappings are shown on this router. If a dynamic mapping is shown, Inverse ARP performed it.
Lenovo R1#show frame map
Hard Drive Serial0 (up): ip 200.1.1.2 dlci 122(0x7A,0x1CA0), dynamic,
Travelstar broadcast,, status defined, active
Gateway Serial0 (up): ip 200.1.1.3 dlci 123(0x7B,0x1CB0), dynamic,
Laptop Parts broadcast,, status defined, active
Software
Static mappings require the use of a frame map statement. To use static mappings, turn Inverse ARP off with the no frame-relay inverse-arp statement, and configure a frame map statement for each remote destination that maps the local DLCI to the remote IP address. Frame Relay requires the broadcast keyword to send broadcasts to the remote device.
Hard Drives R1#conf t
Electronics R1(config)#interface serial0
Canon R1(config-if)#no frame-relay inverse-arp
Desktop Pc R1(config-if)#frame map ip 200.1.1.2 122 broadcast
Desktop Computers R1(config-if)#frame map ip 200.1.1.3 123 broadcast
Think Pad
The syntax of the frame map statement maps the remote IP address to the local DLCI.
Broadcasts will not be transmitted by default; the broadcast option must be configured.
Repair
R1#show frame map
Data Recovery Serial0 (up): ip 200.1.1.2 dlci 122(0x7A,0x1CA0), static,
Cisco broadcast,
Keyboard CISCO, status defined, active
Monitor Serial0 (up): ip 200.1.1.3 dlci 123(0x7B,0x1CB0), static,
Desktop broadcast,
Infosys CISCO, status defined, active
Refurbished Laptops
Hands-on practice is the best way to prepare for CCNA exam success. Working with Frame Relay in a lab environment practically guarantees that you'll truly master the concepts shown here - and then you're on your way to the CCNA and becoming a master network engineer.
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